If you are unfamiliar to Atari ST Operating Systems, you can have a look at my foss-north 2018 presentation. You will learn many things about EmuTOS, FreeMiNT, and much more. Subtitles will be available soon.

Nothing's changed in this regard in the latest release. you still have to compile EmuTOS yourself with FDD support. Problem is, that it got broken in latest version and doesn't work (already reported earlier in this thread), so hopefully next release fixes FDD support for Amiga.